Oil composition, etc.



Patented App 1, i930 UNITED STATES PATENT OFFICE WALTER W. EVANS, OF NEWROCHELLE, NEW YORK, ASSIGNOR TO B, T. VANDERIBILT COMPANY, INCORPORATED,OF NEW YORK, N. Y., A CORPORATION OF NEW YORK OIL COMPOSITION, ETC.

No Drawing.

This invention relates to improvements in oil and grease compositionsand to a treatment of mineral oils-and greases and vegetable and animaloils to give compositions of greater stability than} ordinary 011s andgreases.

According to the present invention, there is added to and compoundedwith the oil or grease composition a small amount of an alkylene diaryldiamine, for example, ethylene diphenyl diamine. The addition of a smallamount of such a product materially improves the aging properties of thecomposition and retards deterioration thereof at high temperatures orunder the influence of an electric current and also retardsdeterioratlon of the composition when exposed to the action of the air.

When mineral oil lubricants, for example, are used in internalcombustion engines, the high temperature to which the pile are subjectedresults in more or less rapid deterioration with loss of lubricatingproperties, particularly where air comes in contact with the oils at thesame time that they are subjected to heat, and the oils undergo more orless decomposition, with the attendant formation of carbon orsludge-like ingredients. Lubrieating oils generally are hydrocarbonoils, although they may have small amounts of vegetable or animal oilscompounded therewith. The addition of a small amount of an alkylenediaryl diamine to a lubricatingboil used under such conditions tends tosta ilize the oil and retard deterioration.

In the case of transformer oils, the addition of a small amount of analkylene diaryl diamine increases the period of usefulness of the oiland prevents or retards its deterioration. By preventing or retardingthe deterioration, the oil may be psed over a greater period of time andthe expense of frequent replacement, etc.,'is eliminated. The saving inoil is appreciable and there is a further saving incident to the use ofa good grade of oil rather than a partially decomposed o l.

' Oils used for saturating cable wrappmgs ure kept at high temperatureover a long Application filed September 23, 1927. Serial No. 221,623.

deterioration, and further deterioration results from the electricalstresses set up when the cable is in use. T he addition of a smallamount of an alkylene diaryl diamine stabilizes the saturating oil,giving it longer life and increasing its efiiciency as an insulator.

The invention is applicable to vegetable and animal oil compositionscontaining fatty acids or glycerides, including cutting oils an othercompositions containing fatty oils. Cutting oils, for example, may becomposed entirely of fatty oils, or of a mixture of animal or vegetableoils and mineral oils. WVhen not stabilized against deterioration, thesetend to become rancid rapidly, particularly during use at elevatedtemperatures. Deterioration produces an undesirable condition in the oilwhich may cause irritation when the oil comes in contact with the handsor other parts of the body of the workmen. By incorporating in thecutting oil composition a small amount of an alkylene diaryl diamine, itis possible to use a greatly increased amount of fatty oil in thecomposition and still maintain stability of the composition and itsresistance to rancidity,

The stabilizing agents-which are added in small amount-s to the oils oroil compositions according to my invention are alkylene diaryldiam'ines. The alkylene diaryl diamines can be obtained by thecondensation ofalkylene dihalides such as ethylene dichloride witharomatic amines such as aniline, etc. Other alkylene halides containingmore than two carbon atoms in the alkylene group can be condensed withaniline or with other aromatic amines, While ethylene dichloride canalso be condensed with other aromatic amines besides aniline, forexample, tolu'idine, naphthylamine, etc.

The alkylene diaryl diamine is employed in the oil or fat compositionsin small amounts, usually less than one percent, for example, from 0.2to 015 of one percent, although the amount can be increased ordecreased.

Example 1.0.25% of ethylene di-paratolyldiamine is added to olive nil Mcfiru fected by oxygen as the untreated oil and remains sweet underoxidizing conditions which Would'render ordinary olive oil rancid.

Example 2.O.5% of ethylene di-para-tol- 5 yldiamine is gradually addedto a refined mineral oil of specific gravity 0.915 such as is used forlubricating cable wrappings of high voltage cables. The oil is heatedand is stirred sufliciently to insure uniform solution of the amine inthe oil. The treated oil has improved properties as a saturant for cablewrappings.

The action of the alkylene diaryl diamine as a stabilizing agent issomewhat obscure but apparently its value lies in the fact that itretards oxidation at the elevated temperatures or under electricalconditions to which the oil compositions are subjected in use, andparticularly Where air or oxygen comes into contact with the oil.

The expression oil, grease or fat is used in the claims to includehydrocarbon oils and greases and animal or vegetable oils and fats.

I claim:

5 1. An oil or grease composition comprising an animal or vegetable oilor fat and a small quantity of an alkylene diaryl diamine.

2. A composition comprising a fatty oil and a fraction of a percent ofanalkylene diaryl diamine.

3. An animal'or vegetable oil or'fat containing an alkylene diaryldiamine to prevent or retard decomposition with resulting rancidity.

4:. A vegetable or animal oil composition. comprising a fraction of apercent of ethylene diphenyl diamine.

- 5. An oil, grease or fat composition com- .prising in addition to theoil, grease or fat a 40 small quantity of an alkylene diaryl diamine.

6. An oil, grease or fat composition comrising in addition to the oil,grease or fat a motion of a percent of" ethylene diphenyl diamine.

In testimony whereof I afiix my signature.

WALTER W. EVANS.

